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uestion 1 points
Which of the following is NOT true of Down syndrome?
Question options:
1) It is a chromosomal disorder in which cells have three copies of chromosome 21.
2) All affected individuals experience cognitive delays, but the intellectual disability is usually mild to moderate.
3) In most cases, it is inherited.
4) The abnormality usually occurs in egg cells, but it occasionally occurs in sperm cells.
Question 2/2
points
The Human Genome Project has estimated that humans have
between _______ and _____ genes.
Question options:
1) 10,000, 15,000
2) 5,000, 7,000
3) 50,000, 70,000
4) 20,000, 25,000
Question 0/2
WRONG
points
Cystic fibrosis gene has been located on:
Question options:
1) chromosome 7
2) chromosome 10
3) chromosome 9
, 4) chromosome 15
Question 0/2
WRONG
points
Which of the following statements is NOT true about
hereditary mutations?
Question options:
1) They are present only in a few cells in a body.
2) They are present in virtually every cell in the body.
3) They are present throughout a person’s life.
4) They are inherited from a parent.
Question 2/2
points
Klinefelter syndrome:
Question options:
1) occurs in males, with an extra chromosome 21.
2) occurs in females with 1 extra X chromosome.
3) is characterized by short stature and a broad neck.
4) is a chromosomal condition that occurs in boys and men, that can affect physical and intellectual abilities.
Question 2/2
points
In Klinefelter syndrome, there is an addition of an extra X
chromosome, which:
Question options:
1) is present in all the cells in one of the parents.
2) occurs only in females.
, 3) occurs during the formation of reproductive cells (egg or sperm) in one of an affected person’s parents.
4) is inherited.
Question 2/2
points
In normal development, how many pairs of chromosomes do
people have in each cell?
Question options:
1) 2 pairs
2) 22 pairs
3) 23 pairs
4) 46 pairs
Question 2/2
points
Genes are defined as:
Question options:
1) the basic unit of heredity
2) specific sequences of RNA
3) Entities, which vary in size, maximum length being less than 100 DNA bases, in humans
4) abnormalities of chromosome structure
Question 2/2
points
A gene mutation is when there is:
Question options:
1) a temporary alteration in a sequence of DNA
2) a temporary alteration in a sequence of RNA